KR20110063439A - Compositions comprising thermoplastic starch - Google Patents

Abstract

The present invention relates to a composition comprising very low density polyethylene, ethylene acrylic acid copolymers and thermoplastic starch and / or constituents thereof with a density of less than 0.905 g / cm ³ .

Description

Compositions Comprising Thermoplastic Starches {Compositions Comprising Thermoplastic Starch}

The present invention relates generally to compositions comprising thermoplastic starch (TPS). In particular, the present invention relates to compositions comprising TPS and polyolefins, methods of making them and articles formed therefrom.

As the emphasis on sustainability and the environment has always increased, studies on developing polymeric materials derived from or including renewable biologically derived components have correspondingly increased.

Much of the current research in developing these polymer materials focuses on using naturally occurring bio-polymers such as starch. Starch is attractive in that it is derived from renewable resources (ie plant products), is readily available and relatively inexpensive. However, the mechanical properties of the starch in its natural form are very bad compared to the mechanical properties of petroleum derived (ie "synthetic") polymers.

The mechanical properties of starch can be improved by melt mixing with a plasticizer such as polyhydric alcohol to form TPS. However, the improved mechanical properties of TPS are still relatively bad compared to the mechanical properties of petroleum derived polymers.

Starch or TPS is therefore not considered a viable alternative to petroleum derived polymers on its own.

In order to derive the advantages of starch and petroleum derived polymers, a significant amount or research has focused on developing blends of these two polymer materials. However, it has proved practically difficult to produce blends with superior properties by mixing generally hydrophobic petroleum derived polymers with relatively hydrophilic starch. In particular, melt treatment of starch or TPS with petroleum derived polymers leads to the formation of polymer blends with multi-phase discontinuous morphology. These particle shapes are typically unstable and exhibit high interfacial tension, which often adversely affects at least the mechanical properties of the resulting polymer blend.

Nevertheless, useful blends of starch or TPS and petroleum derived polymers have been developed. For example, polyester / TPS blends can be formulated to exhibit good mechanical properties and be fully biodegradable. However, due to the hydrolysis sensitivity of the polyester substrates, their use may be limited, for example such blends are generally not suitable for melt-regeneration.

Polyolefin / TPS blends (eg, polyethylene / TPS blends) have been developed. Because of the non-hydrolysis sensitivity of the polyolefin substrates, such blends are at least expected to be more suitable for regeneration than their polyester / TPS analogs. However, the inherent incompatibility between the high hydrophobic properties of polyolefins and the hydrophilic properties of TPS has proven to be a problem in obtaining blends with useful properties.

US 6,605,657 discloses a process for producing polyolefin / TPS blends wherein relatively water-removed TPS is produced in the first extrusion apparatus and mixed with the polyolefin melt produced in the second extrusion apparatus as a melt. The resulting blend exhibits excellent mechanical properties. However, at least the method of making the blend is not without its drawbacks.

Although polymer blends comprising TPS and petroleum derived polymers have been developed, other polymer blends and / or methods for making or treating or ameliorating one or more disadvantages or disadvantages associated with such blends and / or methods of making such blends are useful. At least there remains a chance to offer.

The present invention thus provides a composition comprising very low density polyethylene, ethylene acrylic acid copolymers and thermoplastic starch and / or components thereof having a density of less than 0.905 g / cm ³ .

The compositions according to the invention can be used to provide polymer products which exhibit good compatibility between the polymer components as a blend and exhibit good properties.

In general, the compositions according to the invention have a very low density of polyethylene (VLDPE) of about 5-25% by weight, about 5-25% by weight of ethylene acrylic acid copolymer (EAA) and about 50-80% by weight TPS and / or Its components will be included.

In one embodiment, the composition further comprises one or more polyethylene polymers having a density greater than 0.905 g / cm ³ . In that case, one or more polyethylene polymers having a density greater than 0.905 g / cm ³ will generally be present in an amount of about 5-20% by weight.

Apart from or in addition to one or more polyethylene polymers having a density greater than 0.905 g / cm ³ , the compositions according to the invention may further comprise ethylene vinyl acetate copolymer (EVA). In that case, the EVA will generally be present in an amount in the range of about 1-10% by weight.

Compositions according to the present invention include both pre-melt treatment forms (ie, physical blends of components) and post-melt treatment forms (ie, integral intimate blends of components) of the compositions. Nevertheless, it will be appreciated that the composition according to the invention in the form of pre-melt treatment will be prepared for the sole purpose of subsequent melt treatment into the melt treated product.

TPS may be present in essence in a pre-melt treatment composition or may be advantageously prepared in situ from its components during melt treatment of the composition. Thus, the pre-melting treatment composition according to the invention may comprise components of VLDPE, EAA, TPS and / or TPS, namely starch and one or more plasticizers. Upon melt treatment, the starch and one or more plasticizers in the composition will be converted to TPS and the resulting melt treatment composition will include VLDPE, EAA and TPS. In other words, in the post-melt treatment composition according to the present invention, it is neck wjr that any component of the TPS in the pre-melt treatment composition will be substantially converted to TPS during the melt treatment.

The present invention also provides a process for preparing polyolefin and thermoplastic starch blends, which process very low density polyethylene, ethylene acrylic acid copolymers, and thermoplastic starches and / or components thereof having a density of less than 0.905 g / cm ^3. Melting treatment of the composition comprising a.

The composition to be melt treated according to the method of the present invention may further comprise one or more polyethylene polymers having a density of greater than 0.905 g / cm ³ . In addition to or separately from one or more polyethylene polymers having a density greater than 0.905 g / cm ³ , the composition to be melt treated according to the process of the invention may comprise EVA.

In one embodiment of the present invention, the polyolefin and TPS blends are prepared by (1) melt treating polyolefin and TPS blends prepared according to the invention and (2) one or more polyethylene polymers having a density greater than 0.905 g / cm ^3. do.

Melt-treated polymer compositions according to the present invention exhibit desirable properties such as low sensitivity to moisture, a printable surface, high content of starch, good mechanical properties such as% elongation, and can be readily melt-regenerated. In addition, these properties can be obtained with a relatively high TPS content, which minimizes the amount of petroleum derived polymer in the composition.

Without wishing to be bound by theory, it is believed that the superior properties of the products formed from the composition according to the invention start at least in part from the ability of the composition to provide the TPS and polyethylene components in a high commercialized form. In some embodiments of the invention, the TPS and polyethylene components of the composition are believed to form a stable co-continuous phase morphology.

Other aspects of the invention are described in more detail below.

It is included in the content of this invention.

As used herein, in the context of TPS and polyethylene phase regions, the expression “continuous phase particle shape” means that a continuous path through the phase region can stretch to all phase region boundaries without crossing other phase region boundaries. It means a geometric state. "Stable" in the form of continuous phase particles means that the individual phase regions withstand fusion during or after the melt process.

The compositions according to the invention comprise VLDPE having a density of less than 0.905 g / cm ³ . In general, VLDPE will have a density of about 0.85g / cm ³ to 0.905g / cm ^3, e.g., about 0.88g / cm ³ to 0.905g / cm ^3. VLDPE is known in the art as ultra low density polyethylene (ULDPE) and is generally a copolymer of ethylene and one or more alpha-olefins such as 1-butene, 1-hexene and 1-octene.

VLDPE will generally have a melt index of from about 0.5 g / 10 minutes to about 10 g / 10 minutes at 190 ° C./2.16 kg.

Suitable VLDPE which can be used according to the invention is the density of the ethylene / octene copolymer and from about 0.884g / cm ³ with a melt index of from about 4g / 10 minutes at a density of about 0.904g / cm ³ and 190 ℃ / 2.16kg and Ethylene / butene copolymer with melt index of about 0.7 g / 10 min at 190 ° C./2.16 kg and ethylene / butene with melt index of about 0.8985 g / cm ³ and melt index of about 5 g / 10 min at 190 ° C./2.16 kg Butene copolymers, including but not limited to.

Reference to the density or melt index of a polyethylene polymer means a density or melt index measured according to ASTM D792 and ASTM D1238, respectively.

Compositions according to the present invention comprise EAA. Those skilled in the art will appreciate that EAA is a copolymer of ethylene and acrylic acid. Generally, the acrylic acid content of the copolymer will be about 5-20%, for example 8-15%. EAA will generally have a melt index of from about 10 g / 10 minutes to about 20 g / 10 minutes at 190 ° C./2.16 kg.

Suitable grades of VLDPE and EAA for use in accordance with the present invention may be purchased.

The compositions according to the invention further comprise TPS and its components. Those skilled in the art will appreciate that TPS is a broken form of starch that includes one or more plasticizers. Thus, as used herein, the expression "its components" in the context of a TPS refers to the individual components used to make the TPS.

Starch is a naturally derived polymer composed mainly of repeating glucose groups found mainly in the seeds, fruits, tubers, roots and stems of plants and connected by glucose bonds at 1-4 carbon positions. Starch is composed of two types of alpha-D-glucose polymers: amylose, a substantially linear polymer having a molecular weight of about 1 × 10 ⁵ ; Amylopectin, a branched polymer with a molecular weight of about 1 x 10 ⁷ . Each repeating glucose unit typically has three free hydroxyl groups, providing hydrophilic and reactive functional groups to the polymer. Most starches contain 20-30% amylose and 70-80% amylopectin. However, depending on the source of the starch, the ratio of amylose to amylopectin can vary significantly. For example, some corn hybrids provide starch with 100% amylopectin (char corn starch) or progressively high amylose content of 50-95%. Starch mainly has a water content of about 15% by weight. However, starch can be dried to reduce the water content below 1%.

Starch is typically present in small granules with about 15-45% crystals. The size of the granules can vary depending on the source of the starch. For example, corn starch has a particle size diameter of about 5 μm to about 40 μm, while potato starch typically has a particle size diameter of about 50 μm to about 100 μm.

The "natural" form of starch can be chemically modified. Chemically modified starches include, but are not limited to, oxidized starch, etherified starch, esterified starch, crosslinked starch or combinations of such chemical modifications (eg, etherified and esterified starch). Chemically modified starches are generally prepared by reacting one or more reagents with the hydroxyl groups of the starch. The degree of reaction, often referred to as degree of substitution (DS), can significantly change the physicochemical properties of modified starch when compared to the corresponding natural starch. The DS for natural starch is designated as 0 and can vary up to 3 for a fully substituted modified starch. Depending on the form of the substituents and the DS, chemically modified starches may exhibit significantly different hydrophilic / hydrophobic properties compared to natural starch.

Natural starches and chemically modified starches generally exhibit poor thermoplastic properties. To improve this property, starch can be converted to TPS by means well known in the art. For example, natural starch or chemically modified starch may be melt treated with one or more plasticizers. Polyhydric alcohols are generally used as plasticizers in the preparation of TPS.

Reference to weight percent of TPS is therefore meant to include the total mass of starch and plasticizer constituents of TPS.

Starches from which TPS can be derived include, but are not limited to, corn starch, potato starch, wheat starch, soybean starch, tapioca starch, high amylose starch or combinations thereof.

If the starch is chemically modified, it will generally be etherified or esterified. Suitable etherified starch includes, but is not limited to, those substituted with ethyl and / or propyl groups. Suitable esterified starch includes, but is not limited to, those substituted with actyl, propanoyl and / or butanoyl groups.

In one embodiment of the invention, the starch used to prepare the TPS is corn starch or corn starch acetate with a DS> 0.1.

TPS will generally comprise one or more polyhydric alcohol plasticizers. Suitable polyhydric alcohols are glycerol, ethylene glycol, propylene glycol, ethylene diglycol, propylene diglycol, ethylene triglycol, propylene triglycol, polyethylene glycol, polypropylene glycol, 1,2-propanediol, 1,3-propane Diol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1, 5-hexanediol, 1,2,6-hexanetriol, 1,3,5-hexanetriol, neo-pentyl glycol, trimethylol propane, pentaerythritol, mannitol, sorbitol and acetates thereof , Ethoxylates and propoxylate derivatives.

In one embodiment, the TPS comprises glycerol and / or sorbitol plasticizers.

The plasticizer content of the TPS is generally from about 5% to about 50% by weight, for example from about 10% to about 40% or from about 10% to about 30% by weight relative to the combined mass of starch and plasticizer components. will be.

The composition according to the invention may be a pre-melt treatment composition (eg, a physical blend of VLDPE, EAA and TPS and / or components thereof) or a post-melt treatment composition (eg, VLDPE, EAA and TPS). In the form of a blend).

If the composition according to the invention is provided in a pre-melt treatment form, it will be appreciated that the composition will ultimately be ready for melt treatment and therein to form a melt treated blend of the individual components. In this case, it may be advantageous to replace some or all of the TPS with the components used to make the TPS (ie, starch and one or more plasticizers). In particular, it has been found that starch and one or more plasticizers can be melt treated in the presence of VLDPE and EAA to produce melt treating compositions comprising VLDPE, EAA and TPS.

Compositions according to the invention may comprise from about 5% to about 25% by weight, for example about 15% by weight of VLDPE, about 5% to about 25% by weight, for example about 15% by weight of EAA and about 50% by weight. And from about 80% by weight to about 80% by weight TPS and / or its components, for example.

If the composition according to the invention comprises the constituents of the TPS, it is conceivable that the total mass of these components is essentially the same as the mass of the TPS and therefore uses the same weight percentage range for the TPS outlined for these total components. . The relative weight percent ranges for each component of the TPS are outlined herein.

Compositions according to the present invention may comprise one or more polyethylene polymers having a density greater than 0.905 g / cm ³ . For example, the composition may comprise low density polyethylene (LDPE), which is generally considered to have a density of 0.910 to 0.940 g / cm ³ . Suitable grades of LDPE include, but are not limited to, having a melt index of from about 0.2 g / 10 minutes to about 7 g / 10 minutes at 190 ° C./2.16 kg.

In addition to LDPE or separately, compositions having a density of 0.915g / cm ³ to 0.925g / linear low density polyethylene (LDPE), which generally considered to have a density of cm ^3, 0.926g / cm ³ to 0.940g / cm ³ Medium density polyethylene (MDPE) generally considered to be and / or high density polyethylene (HDPE) generally considered to have a density of at least 0.941 g / cm ³ .

Suitable grades of LDPE, LLDPE, MDPE and HDPE for use in accordance with the present invention may be purchased.

When included, 0.905g / cm ³ At least one polyethylene polymer having a density greater than will generally be present in the composition in an amount from about 5% to about 20% by weight.

For example, the compositions according to the invention may comprise about 10% by weight VLDPE, about 10% by weight EAA, about 65% by weight TPS and / or its components and about 15% by weight LDPE.

0.905g / cm ³ In addition to or separately from one or more polyethylene polymers having a density greater than, the compositions according to the invention may comprise EVA in an amount of about 1% to about 10% by weight.

For example, the composition may comprise about 10% by weight of VLDPE, about 10% by weight of EAA, about 65% of TPS and / or its components, about 10% by weight of LDPE, and about 5% by weight of EVA. .

The compositions according to the invention may comprise one or more additives.

Such additives include fillers (eg calcium carbonate, talc, clay (eg montmolillonite) and titanium dioxide); Pigments; Antistatic agents; And processing aids (eg, calcium stearate, stearic acid, magnesium stearate, sodium stearate, polyethylene oxide, oleamide, stearamide and erucamide).

Generally, the additives will be used in an amount of about 0.5% to about 2% by weight.

Compositions according to the invention provided in the form of melt treated blends may be prepared according to the process of the invention.

Thus, according to the present invention, polyolefin and TPS blends are prepared by melt treating a composition comprising VLDPE, EAA and TPS and / or components thereof.

Melt treatment can be performed using techniques and equipment well known in the art. In general, melt processing is carried out using a continuous extrusion apparatus, such as a single screw extruder, a pair of screw extruders, other multiple screw extruders or Farrell continuous mixers. The melt treatment is carried out for a sufficient time and at an appropriate temperature to enhance intimate mixing between the components of the composition. Those skilled in the art will appreciate that the melt treatment is generally carried out within an appropriate temperature range and this range will vary depending on the nature of the polymer (s) to be treated. In general, the compositions according to the invention will be melt treated at a temperature of about 150 ° C to about 210 ° C.

As mentioned above, when the composition to be melt treated comprises the components of the TPS, the process according to the invention advantageously converts these components into TPS during the melt treatment.

The composition to be melt treated according to the method of the invention may be physically mixed first in a high speed mixer. For example, the method may comprise mixing in a high speed mixer first in the order of addition of one or more polyhydric alcohols such as starch, EAA, VLDPE and glycerol and / or sorbitol. When one or more polyethylene polymers having a density greater than 0.905 g / cm ³ are used in the composition, they can be added immediately after VLDPE. If EVA is used in the composition, all polyethylene polymers can be added immediately after it is added. If one or more additives are used in the composition, they may be added just before the one or more plasticizers.

If the compositions according to the invention comprise one or more polyethylene polymers having a density greater than 0.905 g / cm ³ , such polyethylene component (s) may form part of the composition to be melt treated according to the process of the invention or polyethylene Some or all of the components may be injected as part of the second melt treatment step. For example, polyolefins and TPS blends prepared according to the process of the present invention can be subsequently mixed with polyethylene polymers having a density greater than 0.905 g / cm ³ and the mixture is melt treated to include other polyethylene polymers in the blend. .

Thus, in one embodiment of the present invention, the method further comprises melt treating the polyolefin and TPS blends so formed with one or more polyethylene polymers having a density greater than 0.905 g / cm ³ . In this case, from about 40 wt% to about 60 wt% of the thus formed polyolefin and TPS blend is melt treated with at least one polyethylene polymer having a density of more than 0.905 g / cm ^3, typically from about 60 wt% to about 40 wt% Will be.

The polyolefin and TPS blends according to the present invention have been found to exhibit several superior properties over conventional polyolefin / TPS blends. For example, blends according to the present invention exhibit excellent% elongation even at high (eg, about 40-50% by weight) TPS loads. Thus products such as films formed from this composition may exhibit improved puncture and tear resistance. This blend may exhibit reduced sensitivity to moisture and surfaces particularly suitable for printing are not treated with surface modification techniques such as corona treatment. In particular, the blend may exhibit a wettable surface (eg, having the same surface polarity as about 42-55 dynes) without undergoing surface treatments. Thus the film formed of the composition can be printed without first being surface treated. The blends according to the invention are also very suitable for melt-regeneration.

The polyolefin and TPS blends according to the invention are well suited for producing films and cast articles. These products can be easily used in many applications such as packaging.

Without wishing to be bound by theory, it is believed that the improved properties provided by the blends according to the invention are at least in part due to the TPS and polyethylene phase regions of the highly commercialized blends. In particular, it is contemplated that TPS and polyethylene phase regions can be provided with continuous particle shapes. The high degree of compatibilization between the polyethylene and the TPS phase region is believed to result from a unique blend of VLDPE in combination with EAA and TPS.

Embodiments of the invention are further described with reference to the following non-limiting examples.

Examples

Example  One

The ingredients listed in Table 1 (Composition A) below were first mixed in a high speed mixer in the order of addition of starch, EAA, VLDPE, LDPE, calcium stearate, stearic acid, glycerol and sorbitol. The obtained physical blend was obtained by melting profile 140/170/175/175/165/155 deg.C, torque <80%, screw speed 320-350 rpm, vacuum of -0.05 bar and a hole with a output of 200 kg / h Blend A was prepared by melt treatment in a screw extruder. The film was then prepared by foaming with a composition of 50 wt% Blend A and 50 wt% LLDPE. The film obtained was inspected using a universal tensile tester and had a specification of 15 microns, tensile strength breaking at 14 MPa and elongation> 200%.

Composition A ingredient Grade and manufacturer amount % Corn starch Grade: Edible or Industrial Grade 1 Product
Manufacturer: Shandong Zhucheng Starch Pty Ltd.
Degree of substitution:> 0.1 50kg / 100.8kg 49.60 Glycerol Grade: Saponified Glycerol or Vegetable Glycerol
Manufacturer: Nanjing Soap factory
Purity: ≥96%
Melting Point:> 250deg.C 11kg / 100.8kg 10.91 Sorbitol

Grade: Industrial Sorbitol
Manufacturer: Jiangsu Luo'er Gaici Pty Ltd.
Purity: ≥70%
Melting point:

5kg / 100.8kg 4.96 EAA Rating: Primacor 3340
Manufacturer: DOW
MFI: 10.5 g / 10 mins (190 deg.C, 2.16 kg)
Density: 0.938 g / cm ³
Ethylene-Acrylic Acid Copolymer with Acrylic Acid Content of 9.5% 12kg / 100.8kg 11.91 VLDPE Rating: Attane 4404
Manufacturer: DOW
MFI: 4 g / 10 mins (190 deg.C, 2.16 kg)
Density: 0.904 g / cm ³ 10kg / 100.8kg 9.92 LDPE Rating: 1FTB
Manufacturer: Beijing Yanshan Pty Ltd.
MFI: 7 g / 10 mins (190 deg.C, 2.16 kg)
Density: 0.92 g / cm ³ 12kg / 100.8kg 11.91 Stearic acid Rating: 1801
Manufacturer: Shanghai factory 0.5kg / 100.8kg 0.49 Calcium stearate Rating: 1801
Manufacturer: Shanghai factory 0.3kg / 100.8kg 0.30 all 100.8 kg 100%

Example  2

The ingredients listed in Table 2 (Composition B) below were first mixed in a high speed mixer in the order of addition of starch, LDPE, VLDPE, EAA, calcium stearate, stearic acid, glycerol and sorbitol. The obtained physical blend was obtained by melting profile 140/170/175/175/165/155 deg.C, torque <80%, screw speed 320-350 rpm, vacuum of -0.05 bar and a hole with a output of 200 kg / h Blend B was prepared by melt treatment in a screw extruder. The foam was then foamed using Blend B to make a film. The film obtained was inspected using a universal tensile tester and had a tensile strength breaking at 10 MPa and an elongation of> 250%. The film showed good antiblocking and antistatic properties.

Composition B ingredient Grade and manufacturer amount % Corn starch Grade: Edible or Industrial Grade 1 Product
Manufacturer: Shandong Zhucheng Starch Pty Ltd.
Degree of substitution:> 0.1 42kg / 100.8kg 41.66 Glycerol Grade: Saponified Glycerol or Vegetable Glycerol
Manufacturer: Nanjing Soap factory
Purity: ≥96%
Melting Point:> 250deg.C 11kg / 100.8kg 10.91 Sorbitol

Grade: Industrial Sorbitol
Manufacturer: Jiangsu Luo'er Gaici Pty Ltd.
Purity: ≥70%
Melting point:

10kg / 100.8kg 9.92 EAA Rating: Primacor 3340
Manufacturer: DOW
MFI: 10.5 g / 10 mins (190 deg.C, 2.16 kg)
Density: 0.938 g / cm ³
Ethylene-Acrylic Acid Copolymer with Acrylic Acid Content of 9.5% 12kg / 100.8kg 11.91 VLDPE Rating: Attane 4404
Manufacturer: DOW
MFI: 4 g / 10 mins (190 deg.C, 2.16 kg)
Density: 0.904 g / cm ³ 10kg / 100.8kg 9.92 LDPE Rating: 1FTB
Manufacturer: Beijing Yanshan Pty Ltd.
MFI: 7 g / 10 mins (190 deg.C, 2.16 kg)
Density: 0.92 g / cm ³ 15kg / 100.8kg 14.89 Stearic acid Rating: 1801
Manufacturer: Shanghai factory 0.5kg / 100.8kg 0.49 Calcium stearate Rating: 1801
Manufacturer: Shanghai factory 0.3kg / 100.8kg 0.30 all 100.8 kg 100%

Example  3

The ingredients listed in Table 3 (Composition C) below were first mixed in a high speed mixer in the order of addition of starch, EAA, VLDPE, EVA, LDPE, calcium stearate, stearic acid, glycerol and sorbitol. The physical blends obtained were paired with melt profile 140/165/170/170/170/155 deg.C, torque <80%, screw speed 320-350 rpm, vacuum of -0.05 bar and holes with output of 200 kg / h Blend C was prepared by melt treatment in a screw extruder. The foams were formed by melt treating Blend C with a conventional blowing agent masterbatch. The resulting foam is suitable as a soft foam packaging material and has excellent softness and soft touch properties.

Composition C ingredient Grade and manufacturer amount % Corn starch Grade: Edible or Industrial Grade 1 Product
Manufacturer: Shandong Zhucheng Starch Pty Ltd.
Degree of substitution:> 0.1 50kg / 105.8kg 47.23 Glycerol Grade: Saponified Glycerol or Vegetable Glycerol
Manufacturer: Nanjing Soap factory
Purity: ≥96%
Melting Point:> 250deg.C 11kg / 105.8kg 10.42 Sorbitol

Grade: Industrial Sorbitol
Manufacturer: Jiangsu Luo'er Gaici Pty Ltd.
Purity: ≥70%
Melting point:

5kg / 105.8kg 4.72 EAA Rating: Primacor 3340
Manufacturer: DOW
MFI: 10.5 g / 10 mins (190 deg.C, 2.16 kg)
Density: 0.938 g / cm ³
Ethylene-Acrylic Acid Copolymer with Acrylic Acid Content of 9.5% 12kg / 105.8kg 11.34 VLDPE Rating: Attane 4404
Manufacturer: DOW
MFI: 4 g / 10 mins (190 deg.C, 2.16 kg)
Density: 0.904 g / cm ³ 10kg / 105.8kg 9.45 LDPE Rating: 1FTB
Manufacturer: Beijing Yanshan Pty Ltd.
MFI: 7 g / 10 mins (190 deg.C, 2.16 kg)
Density: 0.92 g / cm ³ 11kg / 105.8kg 10.42 EVA Ratings: 14-2, V4110J
Manufacturer: Beijing Yanshan Pty Ltd., Yangzi Pty Ltd.
MFI: 2g / 10mins (190deg.C, 2.16kg)
Density: 0.93 g / cm ³ 6kg / 105.8kg 5.67 Stearic acid Rating: 1801
Manufacturer: Shanghai factory 0.5kg / 105.8kg 0.47 Calcium stearate Rating: 1801
Manufacturer: Shanghai factory 0.3kg / 105.8kg 0.28 all 105.8 kg 100%

Example  4

Blend B was melt treated with 20 wt% LDPE (melt index 0.3 g / 10 mins and density of 0.922 g / cm ³ ) and molded into 0.380 mm thick sheets. The obtained sheet was heat molded into a cusped sheet.

Example  5

Blend B was foamed into 50 micron film and transformed into a shopping bag with a load carrying capacity of 6 kg. This bag was found to have tear, tensile and elongation properties comparable to bags made of HDPE. The film can be easily printed without cooma pre-treatment using conventional processes.

Example  6

Blend B was melt treated with 10% by weight HDPE and foamed into a film suitable for use in shopping bags. The film obtained was found to be 100% harder than the comparable film made with Blend B.

In this specification and throughout the following claims, the word "comprises", unless the content otherwise requires, refers to the stated integer or step or group of integers or steps, but any other integer or step or integer or step It should be understood that this does not exclude groups of people.

Reference to any preceding publication (or information obtained therefrom) or to any content known herein is part of the general knowledge in the art to which this prior publication (or information obtained therefrom) or known content relates. It is not an admission or acceptance or any form of claim that it constitutes and should not be so interpreted.

Claims (24)

A composition comprising very low density polyethylene, ethylene acrylic acid copolymers and thermoplastic starch and / or components thereof having a density of less than 0.905 g / cm ³ . The method of claim 1,
Very low density polyethylene composition having a density of about 0.85g / cm ³ to 0.905g / cm ^3. The method according to claim 1 or 2,
A composition in the form of a physical blend of very low density polyethylene, ethylene acrylic acid copolymers and thermoplastic starch and / or components thereof. The method according to claim 1 or 2,
A composition in the form of a melt treated blend of very low density polyethylene, ethylene acrylic acid copolymers and thermoplastic starch and / or components thereof. The method according to any one of claims 1 to 4,
The very low density polyethylene is present in an amount of about 5% to about 25% by weight, the ethylene acrylic acid copolymer is present in an amount of about 5% to about 25% by weight, and the thermoplastic starch and / or its components are about Present in an amount of 50% to about 80% by weight. 6. The method according to any one of claims 1 to 5,
The composition further comprises ethylene vinyl acetate copolymer in an amount of about 1% to about 10% by weight. The method according to any one of claims 1 to 6,
At least one polyethylene polymer having a density greater than 0.905 g / cm ³ . The method of claim 7, wherein
At least one polyethylene polymer having a density greater than 0.905 g / cm ³ is selected from low density polyethylene, linear low density polyethylene, medium density polyethylene, and high density polyethylene. The method according to claim 7 or 8,
At least one polyethylene polymer having a density greater than 0.905 g / cm ³ is present in an amount from about 5% to about 20% by weight. The method according to any one of claims 1 to 9,
And at least one additive selected from calcium stearate, stearic acid, magnesium stearate, sodium stearate, polyethylene oxide, oleamide, stearamide and erucamide. A method of making a polyolefin and thermoplastic starch blend comprising melt treating a composition comprising very low density polyethylene, ethylene acrylic acid copolymer and thermoplastic starch and / or components thereof having a density of less than 0.905 g / cm ³ . The method of claim 11,
Very low density polyethylene method having a density of about 0.85g / cm ³ to 0.905g / cm ^3. The method according to claim 11 or 12,
The very low density polyethylene is present in an amount of about 5% to about 25% by weight, the ethylene acrylic acid copolymer is present in an amount of about 5% to about 25% by weight, and the thermoplastic starch and / or its components are about Present in an amount of 50% to about 80% by weight. The method according to any one of claims 11 to 13,
The composition to be melt treated further comprises ethylene vinyl acetate copolymer in an amount of about 1% to about 10% by weight. The method according to any one of claims 11 to 14,
And the composition to be melt treated further comprises one or more polyethylene polymers having a density greater than 0.905 g / cm ³ . The method of claim 15,
At least one polyethylene polymer having a density greater than 0.905 g / cm ³ is selected from low density polyethylene, linear low density polyethylene, medium density polyethylene, and high density polyethylene. The method according to claim 15 or 16,
At least one polyethylene polymer having a density greater than 0.905 g / cm ³ is used in an amount of about 5% to about 20% by weight. The method according to any one of claims 11 to 17,
The polyolefin and thermoplastic starch blends formed are melt treated with one or more polyethylene polymers having a density greater than 0.905 g / cm ³ . The method of claim 18,
Wherein the at least one polyethylene polymer having a density of greater than 0.905 g / cm ³ that is melt treated with the polyolefin and thermoplastic starch blend formed is selected from low density polyethylene, linear low density polyethylene, medium density polyethylene and high density polyethylene. The method of claim 18 or 19,
The polyolefin and thermoplastic starch blends formed and one or more polyethylene polymers having a density greater than 0.905 g / cm ³ are melt treated together in amounts of about 40% to about 60% and about 40% to about 60% by weight, respectively. . An article comprising or produced with a composition according to claim 1. The method of claim 21,
Products in the form of extruded or cast products. The method of claim 22,
Product in the form of a film. An article produced according to claim 11.